#include "../server.hpp"
#define DEFAULT_TIMEOUT 10
// 工具类，提供功能性接口
std::unordered_map<int, std::string> _statu_msg = {
    {100, "Continue"},
    {101, "Switching Protocol"},
    {102, "Processing"},
    {103, "Early Hints"},
    {200, "OK"},
    {201, "Created"},
    {202, "Accepted"},
    {203, "Non-Authoritative Information"},
    {204, "No Content"},
    {205, "Reset Content"},
    {206, "Partial Content"},
    {207, "Multi-Status"},
    {208, "Already Reported"},
    {226, "IM Used"},
    {300, "Multiple Choice"},
    {301, "Moved Permanently"},
    {302, "Found"},
    {303, "See Other"},
    {304, "Not Modified"},
    {305, "Use Proxy"},
    {306, "unused"},
    {307, "Temporary Redirect"},
    {308, "Permanent Redirect"},
    {400, "Bad Request"},
    {401, "Unauthorized"},
    {402, "Payment Required"},
    {403, "Forbidden"},
    {404, "Not Found"},
    {405, "Method Not Allowed"},
    {406, "Not Acceptable"},
    {407, "Proxy Authentication Required"},
    {408, "Request Timeout"},
    {409, "Conflict"},
    {410, "Gone"},
    {411, "Length Required"},
    {412, "Precondition Failed"},
    {413, "Payload Too Large"},
    {414, "URI Too Long"},
    {415, "Unsupported Media Type"},
    {416, "Range Not Satisfiable"},
    {417, "Expectation Failed"},
    {418, "I'm a teapot"},
    {421, "Misdirected Request"},
    {422, "Unprocessable Entity"},
    {423, "Locked"},
    {424, "Failed Dependency"},
    {425, "Too Early"},
    {426, "Upgrade Required"},
    {428, "Precondition Required"},
    {429, "Too Many Requests"},
    {431, "Request Header Fields Too Large"},
    {451, "Unavailable For Legal Reasons"},
    {501, "Not Implemented"},
    {502, "Bad Gateway"},
    {503, "Service Unavailable"},
    {504, "Gateway Timeout"},
    {505, "HTTP Version Not Supported"},
    {506, "Variant Also Negotiates"},
    {507, "Insufficient Storage"},
    {508, "Loop Detected"},
    {510, "Not Extended"},
    {511, "Network Authentication Required"}};

std::unordered_map<std::string, std::string> _mime_msg = {
    {".aac", "audio/aac"},
    {".abw", "application/x-abiword"},
    {".arc", "application/x-freearc"},
    {".avi", "video/x-msvideo"},
    {".azw", "application/vnd.amazon.ebook"},
    {".bin", "application/octet-stream"},
    {".bmp", "image/bmp"},
    {".bz", "application/x-bzip"},
    {".bz2", "application/x-bzip2"},
    {".csh", "application/x-csh"},
    {".css", "text/css"},
    {".csv", "text/csv"},
    {".doc", "application/msword"},
    {".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},
    {".eot", "application/vnd.ms-fontobject"},
    {".epub", "application/epub+zip"},
    {".gif", "image/gif"},
    {".htm", "text/html"},
    {".html", "text/html"},
    {".ico", "image/vnd.microsoft.icon"},
    {".ics", "text/calendar"},
    {".jar", "application/java-archive"},
    {".jpeg", "image/jpeg"},
    {".jpg", "image/jpeg"},
    {".js", "text/javascript"},
    {".json", "application/json"},
    {".jsonld", "application/ld+json"},
    {".mid", "audio/midi"},
    {".midi", "audio/x-midi"},
    {".mjs", "text/javascript"},
    {".mp3", "audio/mpeg"},
    {".mpeg", "video/mpeg"},
    {".mpkg", "application/vnd.apple.installer+xml"},
    {".odp", "application/vnd.oasis.opendocument.presentation"},
    {".ods", "application/vnd.oasis.opendocument.spreadsheet"},
    {".odt", "application/vnd.oasis.opendocument.text"},
    {".oga", "audio/ogg"},
    {".ogv", "video/ogg"},
    {".ogx", "application/ogg"},
    {".otf", "font/otf"},
    {".png", "image/png"},
    {".pdf", "application/pdf"},
    {".ppt", "application/vnd.ms-powerpoint"},
    {".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"},
    {".rar", "application/x-rar-compressed"},
    {".rtf", "application/rtf"},
    {".sh", "application/x-sh"},
    {".svg", "image/svg+xml"},
    {".swf", "application/x-shockwave-flash"},
    {".tar", "application/x-tar"},
    {".tif", "image/tiff"},
    {".tiff", "image/tiff"},
    {".ttf", "font/ttf"},
    {".txt", "text/plain"},
    {".vsd", "application/vnd.visio"},
    {".wav", "audio/wav"},
    {".weba", "audio/webm"},
    {".webm", "video/webm"},
    {".webp", "image/webp"},
    {".woff", "font/woff"},
    {".woff2", "font/woff2"},
    {".xhtml", "application/xhtml+xml"},
    {".xls", "application/vnd.ms-excel"},
    {".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
    {".xml", "application/xml"},
    {".xul", "application/vnd.mozilla.xul+xml"},
    {".zip", "application/zip"},
    {".3gp", "video/3gpp"},
    {".3g2", "video/3gpp2"},
    {".7z", "application/x-7z-compressed"}};

class Util
{
public:
    // 字符串分割函数，分割后的子串放到vector里面，最终返回子串的数量
    static size_t Split(const std::string &src, const std::string &sep, std::vector<std::string> *arry)
    {
        size_t offset = 0;

        while (offset < src.size())
        {
            size_t pos = src.find(sep, offset); // 在src字符串偏移量offset处，开始向后查找sep字符/子串，返回查找到的位置
            if (pos == std::string::npos)
            {
                // 没有找到特定字符
                if (pos == src.size())
                    break;
                arry->push_back(src.substr(offset));
                return arry->size();
            }
            if (pos == offset)
            {
                offset = pos + sep.size();
                continue;
            } // 当前子串是空的，没有内容
            arry->push_back(src.substr(offset, pos - offset));
            offset = pos + sep.size();
        }
        return arry->size();
    }
    // 读取文件所有内容，将读取的内容放到buffer中
    static bool ReadFile(const std::string &filename, std::string *buf)
    {
        std::ifstream ifs(filename, std::ios::binary);
        if (ifs.is_open() == false)
        {
            ERR_LOG("OPEN %s FILE FAILED!!", filename.c_str());
            return false;
        }
        size_t fsize = 0;
        // 文件指针跳转到末尾
        ifs.seekg(0, ifs.end);
        fsize = ifs.tellg();   // 获取当前读写位置相对于起始位置的偏移量，从末尾偏移刚好就是文件大小
        ifs.seekg(0, ifs.beg); // 跳转到起始位置
        buf->resize(fsize);    // 开辟文件大小的空间
        ifs.read(&(*buf)[0], fsize);
        if (ifs.good() == false)
        {
            // 读取失败
            ERR_LOG("READ %s FILE FAILED!!", filename.c_str());
            ifs.close();
            return false;
        }
        ifs.close();
        return true;
    }
    // 向文件写入数据
    static bool WriteFile(const std::string &filename, const std::string &buf)
    {
        std::ofstream ofs(filename, std::ios::binary | std::ios::trunc); // trunc代表截断
        if (ofs.is_open() == false)
        {
            ERR_LOG("READ %s FILE FAILED!!", filename.c_str());
            return false;
        }
        ofs.write(buf.c_str(), buf.size());
        if (ofs.good() == false)
        {
            ERR_LOG("WRITE %s FILE FAILED!", filename.c_str());
            ofs.close();
            return false;
        }
        ofs.close();
        return true;
    }
    // URL编码，避免URL中资源路径与查询字符串中的特殊字符与HTTP请求中特殊字符产生歧义
    // 编码格式：将特殊字符的ASCII值，转换为两个16进制字符，C++ -> C%2B%2B
    // 不编码的特殊字符 RFC3986文档规定.-_~字母，数字属于绝对不编码字符，编码格式%HH
    // W3C文档中规定查询字符串中的空格，需要被编码为 +，解码则是 + 转化为空格
    static std::string UrlEncode(const std::string url, bool convert_space_to_plus)
    {
        std::string res;
        for (auto &c : url)
        {
            if (c == '.' || c == '-' || c == '_' || c == '~' || isalnum(c))
            {
                res += c;
                continue;
            }
            if (c == ' ' && convert_space_to_plus == true)
            {
                res += '+';
                continue;
            }
            // 剩下的字符都是需要编码称为%HH的格式的
            char tmp[4] = {0};
            snprintf(tmp, 4, "%%%02X", c);
            res += tmp;
        }
        return res;
    }
    static char HEXTOI(char c)
    {
        if (c >= '0' && c <= '9')
        {
            // 数字字符
            return c - '0';
        }
        else if (c >= 'a' && c <= 'z')
        {
            return c - 'a' + 10;
        }
        else if (c >= 'A' && c <= 'Z')
        {
            return c - 'A' + 10;
        }
        return -1;
    }
    // URL解码
    static std::string UrlDecode(const std::string url, bool convert_space_to_space)
    {
        // 遇到%，则将紧随其后的两个字符，转化为数字，第一个数字左移四位，然后加上第二个数字
        // eg：%2b = 2 * 2^4 + b(转化为十进制)
        std::string res;
        for (int i = 0; i < url.size(); i++)
        {
            if (url[i] == '+' && convert_space_to_space == true)
            {
                res += ' ';
                continue;
            }
            if (url[i] == '%' && i + 2 < url.size())
            {
                char v1 = HEXTOI(url[i + 1]);
                char v2 = HEXTOI(url[i + 2]);
                char v = (v1 << 4) + v2;
                res += v;
                i += 2;
                continue;
            }
            res += url[i];
        }
        return res;
    }
    // 相应状态码的描述信息获取
    static std::string StatuDesc(int statu)
    {

        auto it = _statu_msg.find(statu);
        if (it != _statu_msg.end())
        {
            return it->second;
        }
        return "Unknown";
    }
    // 根据文件后缀名获取文件mime
    static std::string ExtMime(const std::string &filename)
    {

        // a.b.txt
        size_t pos = filename.find_last_of('.');
        if (pos == std::string::npos)
        {
            return "application/octet-stream";
        }
        std::string ext = filename.substr(pos);
        auto it = _mime_msg.find(ext);
        if (it == _mime_msg.end())
        {
            return "application/octet-stream";
        }
        return it->second;
    }
    // 判断一个文件是否是一个目录
    static bool IsDirectory(const std::string &filename)
    {
        struct stat st;
        int ret = stat(filename.c_str(), &st);
        if (ret < 0)
        {
            return false;
        }
        return S_ISDIR(st.st_mode);
    }
    // 判断一个文件是否是一个普通文件
    static bool IsRegular(const std::string &filename)
    {
        struct stat st;
        int ret = stat(filename.c_str(), &st);
        if (ret < 0)
        {
            return false;
        }
        return S_ISREG(st.st_mode);
    }
    // http请求的资源路径有效性判断
    // /index.html --- 前面的/也叫做相对目录 映射的是某个服务器上的子目录
    // 想表达的意思就是，客户端只能请求相对根目录中的资源，其他地方就不予理会
    // /../login.html这个路径是在相对根目录之外，不合理
    static bool ValidPath(const std::string &path)
    {
        std::vector<std::string> subdir;
        Split(path, "/", &subdir);
        int level = 0;
        for (auto &dir : subdir)
        {
            if (dir == "..")
            {
                level--;
                if (level < 0)
                {
                    return false;
                }
                continue;
            }
            level++;
        }
        return true;
    }
};

class HttpRequest
{
public:
    std::string _method;                                   // 请求方法
    std::string _path;                                     // 资源路径
    std::string _version;                                  // 协议版本
    std::string _body;                                     // 请求正文
    std::smatch _matches;                                  // 资源路径的正则提取数据
    std::unordered_map<std::string, std::string> _headers; // 头部字段
    std::unordered_map<std::string, std::string> _params;  // 查询字符串通常指的是 URL 中的查询参数
public:
    HttpRequest()
        : _version("HTTP/1.1")
    {
    }
    void ReSet()
    {
        _method.clear();
        _path.clear();
        _version = "HTTP/1.1";
        _body.clear();
        std::smatch match;
        _matches.swap(match);
        _headers.clear();
        _params.clear();
    }
    // 插入头部字段
    void SetHeader(std::string &key, std::string &val)
    {
        _headers.insert(std::make_pair(key, val));
    }
    // 判断是否存在指定头部字段
    bool HasHeader(const std::string &key) const
    {
        auto it = _headers.find(key);
        if (it == _headers.end())
        {
            return false;
        }
        return true;
    }
    // 获取指定头部字段的值
    std::string GetHeader(const std::string &key) const
    {
        auto it = _headers.find(key);
        if (it == _headers.end())
        {
            return "";
        }
        return it->second;
    }
    // 插入查询字符串
    void SetParam(const std::string &key, const std::string &val)
    {
        _params.insert(std::make_pair(key, val));
    }
    // 判断是否有某个指定的查询字符串
    bool HasParam(const std::string &key) const
    {
        auto it = _params.find(key);
        if (it == _params.end())
        {
            return false;
        }
        return true;
    }
    // 获取指定的查询字符串
    std::string GetParam(const std::string &key) const
    {
        auto it = _params.find(key);
        if (it == _params.end())
        {
            return "";
        }
        return it->second;
    }
    // 获取正文长度
    size_t ContentLength() const
    {
        bool ret = HasHeader("Content-Length");
        if (ret == false)
        {
            return 0;
        }
        std::string clen = GetHeader("Content-Length");
        return std::stol(clen);
    }
    // 判断是否为短连接
    bool Close() const
    {
        // 没有Connection字段或者有Connection但是值是false，则都是短连接，否则是长连接
        // DBG_LOG("%d", HasHeader("Connection") == true);
        // DBG_LOG("%d", GetHeader("Connection") == "keep-alive");
        // DBG_LOG("[%s]", GetHeader("Connection").c_str());
        if (HasHeader("Connection") == true && GetHeader("Connection") == "keep-alive")
        {
            return false;
        }
        return true;
    }
};

class HttpResponse
{
public:
    int _statu;
    bool _redirect_flag;
    std::string _body;
    // 重定向
    // 在Web开发中，HTTP 重定向是指服务器返回一个特殊的响应（状态码3xx），
    // 指示客户端（如浏览器）访问另一个URL。
    std::string _redirect_url;
    std::unordered_map<std::string, std::string> _headers;

public:
    HttpResponse()
        : _redirect_flag(false),
          _statu(200)
    {
    }
    HttpResponse(int statu)
        : _redirect_flag(false),
          _statu(statu)
    {
    }
    void ReSet()
    {
        _statu = 200;
        _redirect_flag = false;
        _body.clear();
        _redirect_url.clear();
        _headers.clear();
    }
    // 插入头部字段
    void SetHeader(const std::string &key, const std::string &val)
    {
        _headers.insert(std::make_pair(key, val));
    }
    // 判断是否存在指定头部字段
    bool HasHeader(const std::string &key)
    {
        auto it = _headers.find(key);
        if (it == _headers.end())
        {
            return false;
        }
        return true;
    }
    // 获取指定头部字段的值
    std::string GetHeader(const std::string &key)
    {
        auto it = _headers.find(key);
        if (it == _headers.end())
        {
            return "";
        }
        return it->second;
    }
    void SetContent(const std::string &body, const std::string &type = "text/html")
    {
        _body = body;
        SetHeader("Content-Type", type);
    }
    void SetRedirect(const std::string &url, int statu = 302)
    {
        _statu = statu;
        _redirect_flag = true;
        _redirect_url = url;
    }
    bool Close()
    {
        // 没有Connection字段或者有Connection但是值是false，则都是短连接，否则是长连接
        if (HasHeader("Connection") == true && GetHeader("Connection") == "keep-alive")
        {
            return false;
        }
        return true;
    }
};

typedef enum
{
    RECV_HTTP_ERROR,
    RECV_HTTP_LINE,
    RECV_HTTP_HEAD,
    RECV_HTTP_BODY,
    RECV_HTTP_OVER
} HttpRecvStatu;

#define MAX_LINE 8192 // 通常设置为8kb
class HttpContext
{
private:
    int _resp_statu;           // 相应状态码
    HttpRecvStatu _recv_statu; // 当前接收及解析的阶段状态
    HttpRequest _request;      // 已经解析得到的请求信息
private:
    // 解析请求行
    bool ParseHttpLine(const std::string &line)
    {
        // std::cout << "string " << line << std::endl;
        std::smatch matches;
        std::regex e("(GET|HEAD|POST|PUT|DELETE) ([^?]*)(?:\\?(.*))? (HTTP/1\\.[01])(?:\n|\r\n)?", std::regex::icase);
        bool ret = std::regex_match(line, matches, e);
        if (ret == false)
        {
            std::cout << line << std::endl;
            // std::cout << "ParseHttpLine 1 error" << std::endl;
            _recv_statu = RECV_HTTP_ERROR;
            _resp_statu = 400;
            return false;
        }
        // 请求方法的获取
        _request._method = matches[1];
        std::transform(_request._method.begin(), _request._method.end(), _request._method.begin(), ::toupper);
        // 资源路径的获取，需要进行URL解码操作，但是不需要+转空格
        _request._path = Util::UrlDecode(matches[2], false);
        // 协议版本的获取
        _request._version = matches[4];
        // 查询字符串的读取与处理
        std::vector<std::string> query_string_arry;
        std::string query_string = matches[3];
        // 查询字符串的格式 key=value&key=value... ,先以&符号进行分割，得到各个子串
        Util::Split(query_string, "&", &query_string_arry);
        // 针对各个子串，以 = 符号进行分割，得到key 和 val，得到之后也需要进行URL解码
        for (auto &str : query_string_arry)
        {
            size_t pos = str.find("=");
            if (pos == std::string::npos)
            {
                // 没有找到
                // std::cout << "ParseHttpLine 2 error" << std::endl;
                _recv_statu = RECV_HTTP_ERROR;
                _resp_statu = 400;
                return false;
            }
            std::string key = Util::UrlDecode(str.substr(0, pos), true);
            std::string val = Util::UrlDecode(str.substr(pos + 1), true);
            _request.SetParam(key, val);
        }
        return true;
    }
    // 接收请求行
    bool RecvHttpLine(Buffer *buf)
    {
        if (_recv_statu != RECV_HTTP_LINE)
            return false;
        // 1.获取一行数据
        std::string line = buf->GetLineAndPop();
        // std::cout << line << " " << "RecvHttpLine" << std::endl;
        //  2.需要考虑的一些要素：缓冲区中的数据不足一行，获取的一行数据超大
        if (line.size() == 0)
        {
            // 缓冲区中的数据不足一行，则需要判断缓冲区中的可读数据长度，如果很长了都不足一行，这是有问题的
            if (buf->ReadAbleSize() > MAX_LINE)
            {
                _recv_statu = RECV_HTTP_ERROR;
                _resp_statu = 414; // URI TOO LONG
                return false;
            }
            // 缓冲区中数据不足一行，但是也不多，就等等新数据的到来
            return true;
        }
        if (line.size() > MAX_LINE)
        {
            _recv_statu = RECV_HTTP_ERROR;
            _resp_statu = 414; // URI TOO LONG
            return false;
        }
        bool ret = ParseHttpLine(line);
        if (ret == false)
        {
            return false;
        }
        // buf->MoveReadOffset(line.size());
        _recv_statu = RECV_HTTP_HEAD;
        return true;
        // return ParseHttpLine(line);
    }
    bool RecvHttpHead(Buffer *buf)
    {
        if (_recv_statu != RECV_HTTP_HEAD)
            return false;
        // 一行一行取出数据，直到遇到空行为止
        // 并且头部的格式为key:val\r\nkey:val\r\n
        while (1)
        {
            //  1.获取一行数据
            std::string line = buf->GetLineAndPop();
            // std::cout << "RecvHttpHead " << line << std::endl;
            //  2.需要考虑的一些要素：缓冲区中的数据不足一行，获取的一行数据超大
            if (line.size() == 0)
            {
                // 缓冲区中的数据不足一行，则需要判断缓冲区中的可读数据长度，如果很长了都不足一行，这是有问题的
                if (buf->ReadAbleSize() > MAX_LINE)
                {
                    _recv_statu = RECV_HTTP_ERROR;
                    _resp_statu = 414; // URI TOO LONG
                    return false;
                }
                // 缓冲区中数据不足一行，但是也不多，就等等新数据的到来
                return true;
            }
            if (line.size() > MAX_LINE)
            {
                _recv_statu = RECV_HTTP_ERROR;
                _resp_statu = 414; // URI TOO LONG
                return false;
            }
            if (line == "\n" || line == "\r\n")
            {
                break;
            }
            bool ret = ParseHttpHead(line);
            if (ret == false)
            {
                return false;
            }
        }
        _recv_statu = RECV_HTTP_BODY;
        return true;
    }
    bool ParseHttpHead(std::string &line)
    {
        if (line.back() == '\n')
            line.pop_back(); // 末尾是换行，则去掉
        if (line.back() == '\r')
            line.pop_back(); // 有回车，则去掉
        size_t pos = line.find(": ");
        if (pos == std::string::npos)
        {
            // std::cout << "ParseHttpHead error" << std::endl;
            _recv_statu = RECV_HTTP_ERROR;
            _resp_statu = 400;
            return false;
        }
        std::string key = line.substr(0, pos);
        std::string val = line.substr(pos + 2);
        _request.SetHeader(key, val);
        return true;
    }
    bool RecvHttpBody(Buffer *buf)
    {
        if (_recv_statu != RECV_HTTP_BODY)
            return false;
        // 1.获取正文长度
        size_t content_length = _request.ContentLength();
        if (content_length == 0)
        {
            // 没有正文，则请求接收请求完毕
            _recv_statu = RECV_HTTP_OVER;
            return true;
        }
        // 2.当前已经接收了多少正文，其实就是往_request._body中放了多少数据
        size_t real_len = content_length - _request._body.size(); // 实际还需要接受的正文长度
        // 3.接收正文放到body中，但是也要考虑当前缓冲区中的数据是否是全部的正文
        // 3.1缓冲区中的数据，包含了当前请求的所有正文，取出所需的数据
        if (buf->ReadAbleSize() >= real_len)
        {
            _request._body.append(buf->ReadPosition(), real_len);
            buf->MoveReadOffset(real_len);
            _recv_statu = RECV_HTTP_OVER;
            return true;
        }

        // 3.2缓冲区中的数据，无法满足当前正文的需要，数据不足，取出数据，然后等待新数据到来
        _request._body.append(buf->ReadPosition(), buf->ReadAbleSize());
        buf->MoveReadOffset(buf->ReadAbleSize());
        return true;
    }

public:
    HttpContext()
        : _resp_statu(200),
          _recv_statu(RECV_HTTP_LINE)
    {
    }
    void ReSet()
    {
        _resp_statu = 200;
        _recv_statu = RECV_HTTP_LINE;
        _request.ReSet();
    }
    int RespStatu()
    {
        return _resp_statu;
    }
    HttpRecvStatu RecvStatu()
    {
        return _recv_statu;
    }
    HttpRequest &Request()
    {
        return _request;
    }
    // 接收并解析Http请求
    void RecvHttpRequest(Buffer *buf)
    {
        // buf->TestPrint();
        //  不同的状态，做不同的事情
        //  不需要加入break，完成一步后直接进行下一步
        switch (_recv_statu)
        {
        case RECV_HTTP_LINE:
            RecvHttpLine(buf);
        case RECV_HTTP_HEAD:
            RecvHttpHead(buf);
        case RECV_HTTP_BODY:
            RecvHttpBody(buf);
        }
        return;
    }
};

class HttpServer
{
public:
    using Handler = std::function<void(const HttpRequest &, HttpResponse *)>;
    using Handlers = std::vector<std::pair<std::regex, Handler>>;
    Handlers _get_route;
    Handlers _post_route;
    Handlers _put_route;
    Handlers _delete_route;
    std::string _basedir; // 静态资源根目录
    TcpServer _server;

private:
    void ErrorHandler(const HttpRequest &req, HttpResponse *rsp)
    {
        // 1.组织一个错误展示页面
        std::string body;
        body += "<html>";
        body += "<head>";
        body += "<meta http-equiv='Content-Type' content='text/html;charset=utf-8'>";
        body += "</head>";
        body += "<body>";
        body += "<h1>";
        body += std::to_string(rsp->_statu);
        body += " ";
        body += Util::StatuDesc(rsp->_statu);
        body += "</h1>";
        body += "</body>";
        body += "</html>";
        // 2.将页面数据，当做响应正文，放入rsp中
        rsp->SetContent(body, "text/html");
    }
    // 将HttpResponse中的要素按照http协议格式进行组织，发送
    void WriteResponse(const PtrConnection &conn, const HttpRequest &req, HttpResponse &rsp)
    {
        // 1.先完善头部字段
        // req是const，调用的Close也必须是const类型
        if (req.Close() == true)
        {
            rsp.SetHeader("Connection", "close");
        }
        else
        {
            rsp.SetHeader("Connection", "keep-alive");
        }
        if (rsp._body.empty() == false && rsp.HasHeader("Content-Length") == false)
        {
            rsp.SetHeader("Content-Length", std::to_string(rsp._body.size()));
        }
        if (rsp._body.empty() == false && rsp.HasHeader("Content-Type") == false)
        {
            rsp.SetHeader("Content-Type", "application/octet-stream"); // 二进制流
        }
        if (rsp._redirect_flag == true)
        {
            rsp.SetHeader("Location", rsp._redirect_url);
        }
        // 2.将rsp的要素，按照http协议进行组织
        std::stringstream rsp_str;
        rsp_str << req._version << " " << std::to_string(rsp._statu) << " " << Util::StatuDesc(rsp._statu) << "\r\n";
        for (auto &head : rsp._headers)
        {
            rsp_str << head.first << ":" << head.second << "\r\n";
        }
        rsp_str << "\r\n";
        rsp_str << rsp._body;
        // 3.发送数据
        conn->Send(rsp_str.str().c_str(), rsp_str.str().size());
    }
    // 判断是否为静态资源
    bool IsFileHandler(const HttpRequest &req)
    {
        // 1.必须设置了静态资源根目录
        if (_basedir.empty())
        {
            return false;
        }
        // 2.请求方法必须是GET或者HEAD
        if (req._method != "GET" && req._method != "HEAD")
        {
            return false;
        }
        // 3.请求的资源路径必须是一个合法路径
        if (Util::ValidPath(req._path) == false)
        {
            return false;
        }
        // 4.请求的资源必须存在
        // 直接请求根目录是比较特殊的，此时直接追加到首页
        // 不要忘记前缀的相对根目录
        std::string req_path = _basedir + req._path; // 避免直接修改请求的资源路径
        if (req_path.back() == '/')
        {
            req_path += "index.html";
        }
        if (Util::IsRegular(req_path) == false)
        {
            return false;
        }
        // req._path = req_path; //如果请求就是静态资源请求，则有可能需要追加index.html
        return true;
    }
    // 静态资源请求处理 -- 将静态资源文件的数据读取出来，放到rsp的_body，并设置mime
    void FileHandler(const HttpRequest &req, HttpResponse *rsp)
    {
        std::string req_path = _basedir + req._path; // 避免直接修改请求的资源路径
        if (req_path.back() == '/')
        {
            req_path += "index.html";
        }
        bool ret = Util::ReadFile(req_path, &rsp->_body);
        if (ret == false)
        {
            return;
        }
        std::string mime = Util::ExtMime(req_path);
        rsp->SetHeader("Content-Type", mime);
        return;
    }
    // 功能性请求的分类处理
    void Dispatcher(HttpRequest &req, HttpResponse *rsp, Handlers &handlers)
    {
        // 在对应请求方法的路由表中，查找是哦否含有对应资源请求的处理函数，有则调用，没有则返回404
        // 思想：路由表存储的是键值对 -- 正则表达式 & 处理函数
        // 使用正则表达式，对请求的资源路径进行正则匹配，匹配成功就是有对应函数进行处理
        for (auto &handler : handlers)
        {
            const std::regex &re = handler.first;
            const Handler &functor = handler.second;
            // std::cout << "进入了这里" << std::endl;
            // std::cout << "req._path" << req._path << "req._matches" << req._matches[1] << std::endl;
            // std::cout << "req._path" << req._path <<std::endl;
            bool ret = std::regex_match(req._path, req._matches, re);
            if (ret == false)
            {
                continue;
            }
            return functor(req, rsp); // 传入请求信息，和空的rsp执行处理函数
            // std::cout << "到这里没有出错" << std::endl;
        }
        // std::cout << "改成404" << std::endl;
        rsp->_statu = 404;
    }
    // 路由查找匹配
    void Route(HttpRequest &req, HttpResponse *rsp)
    {
        // 1.对请求资源进行分辨，是一个静态资源请求，还是一个功能性请求
        // 静态资源请求，则进行静态资源处理
        // 功能性请求，则需要通过几个请求路由表来确定是否有处理函数
        // 既不是静态资源请求，也不是功能性处理请求，则返回404
        if (IsFileHandler(req) == true)
        {
            // 是一个静态资源请求，则进行静态资源请求的处理
            // std::cout << "进入了这里" << std::endl;
            return FileHandler(req, rsp);
        }
        // HEAD与GET类似，只不过不要响应正文
        // std::cout << "req._method" << req._method << std::endl;
        if (req._method == "GET" || req._method == "HEAD")
        {
            // std::cout << "使用了GET调用函数添加处理" << std::endl;
            return Dispatcher(req, rsp, _get_route);
        }
        else if (req._method == "POST")
        {
            return Dispatcher(req, rsp, _post_route);
        }
        else if (req._method == "PUT")
        {
            return Dispatcher(req, rsp, _put_route);
        }
        else if (req._method == "DELETE")
        {
            return Dispatcher(req, rsp, _delete_route);
        }
        rsp->_statu = 405; // METHOD NOT ALLOWED
    }
    // 设置上下文
    void OnConnected(const PtrConnection &conn)
    {
        conn->SetContext(HttpContext());
        DBG_LOG("NEW CONNECTION %p", conn.get());
    }
    // 缓冲区数据解析 + 处理
    void OnMessage(const PtrConnection &conn, Buffer *buffer)
    {
        while (buffer->ReadAbleSize() > 0) // 有数据就继续处理
        {
            // 1.获取上下文
            HttpContext *context = conn->GetContext()->get<HttpContext>();
            // 2.通过上下文对缓冲区数据进行解析，得到HttpRequest对象
            // 1.如果缓冲区的数据解析出错，就直接回复出错响应
            // 2.如果解析正常，且请求已经获取完毕，才开始去进行处理
            context->RecvHttpRequest(buffer);
            HttpRequest &req = context->Request();
            HttpResponse rsp(context->RespStatu());
            if (context->RespStatu() >= 400)
            {
                // 出错了，关闭连接
                ErrorHandler(req, &rsp);       // 填充一个错误显示页面数据到rsp中
                WriteResponse(conn, req, rsp); // 组织响应发送给客户端

                context->ReSet(); //！！！重要代码行！！！如果不清空状态的话，他的状态码会一直在400多，导致不断给客户端发送出错信息
                buffer->MoveReadOffset(buffer->ReadAbleSize()); //出错了把缓冲区清空不再处理

                conn->Shutdown(); // 关闭连接
                return;
            }
            if (context->RecvStatu() != RECV_HTTP_OVER)
            {
                // 当前请求还没有接受完整，则退出，等到新数据到来再重新处理
                return;
            }

            // 3.请求路由 + 业务处理
            Route(req, &rsp);
            // 4.对HttpResponse进行组织发送
            //DBG_LOG("%s", rsp._body.c_str());
            WriteResponse(conn, req, rsp);
            // 5.重置上下文
            context->ReSet();
            // 5.根据长短连接判断是否连接或者继续处理
            if (rsp.Close() == true) // 短连接
            {
                conn->Shutdown();
            }
        }
        return;
    }

public:
    HttpServer(int port, int timeout = DEFAULT_TIMEOUT)
        : _server(port)
    {
        _server.EnableInactiveRelease(timeout);
        _server.SetConnectedCallback(std::bind(&HttpServer::OnConnected, this, std::placeholders::_1));
        _server.SetMessageCallback(std::bind(&HttpServer::OnMessage, this, std::placeholders::_1, std::placeholders::_2));
    }
    void SetBaseDir(const std::string &path)
    {
        int ret = Util::IsDirectory(path);
        assert(ret == true);
        _basedir = path;
    }
    /*设置/添加请求(请求的正则表达式)与处理函数的映射关系*/
    void Get(const std::string &patten, const Handler &handler)
    {
        _get_route.push_back(std::make_pair(std::regex(patten), handler));
    }
    void Post(const std::string &patten, const Handler &handler)
    {
        _post_route.push_back(std::make_pair(std::regex(patten), handler));
    }
    void Put(const std::string &patten, const Handler &handler)
    {
        _put_route.push_back(std::make_pair(std::regex(patten), handler));
    }
    void Delete(const std::string &patten, const Handler &handler)
    {
        _delete_route.push_back(std::make_pair(std::regex(patten), handler));
    }
    void SetThreadCount(int count)
    {
        _server.SetThreadCount(count);
    }
    void Listen()
    {
        _server.Start();
    }
};